The Vaccines' Justin Young is disappointed he hasn't gained more confidence since achieving success, and says his mental state varies from "delusional narcissism to crippling insecurity"

The Vaccines frontman suffers from a lack of confidence and is disappointed fame hasn't made him as self-assured as he hoped.

He said: "My mental state swings from delusional narcissism to crippling insecurity. I've always been shy and I used to think if I were ever in a position where my reputation precedes me, that it would be so great for my confidence. But it hasn't been.

"I don't feel like I've changed as much as I'd hoped I would. I thought things would get easier socially. I thought people would come to me.

"I just thought maybe ... sometimes I see people in bars and clubs and they're holding court and they're surrounded by good-looking girls and I find that they're an aspiring musician or whatever and I think, well, people just want to be around them because they're in a band."

Before forming The Vaccines, Justin was a solo artist called Jay Jay Pistolet, but he now "hates" everything about his failed attempt at cracking the music industry alone.

He added to NME magazine: "People know full well that my attempt to be a solo artist failed miserably.

"I hate the name. I hate the idea of people YouTubing it, I hate seeing it in print.

"It came from the pretensions of my 19-year-old head. It was something I did through necessity."